It is an inherent problem with 'one world government' that a central authority making the plans never will optimize for the local regions.

Yeah this is a great observation. In particular, the drive for homogenization of all cultures, ideologies, genetic lineages etc. makes sense in light of this ("Solve et coagula"). It's perhaps their attempt to minimize the worldwide differences they have to deal with.

The communists did the same because their aim was similar: centralized rule (eg: Mao's "cultural revolution" killed the Old China).